For those going for head shots, I say, more power to ya if'n you can do it, and I'm not worthy. And you probably have a lot more turkeys and/or opportunity to hunt than I do. And/or maybe you have a lot less hunting pressure on the birds.
That head, less than 3" wide, bobbing and weaving with every step, and stuck out and back with every gobble is way more of a precise target than I'd like to have to hit when I get my chance at a gobbler. I have some pretty accurate rifles, and I'm a decent shot, and I would still probably have to take 3-4 shots for every hit under field conditions trying to hit the head or neck. Turkeys don't stand still for several seconds in a row like deer do. Usually 1 or 1.5 seconds max, before they move again. Thank you, but I'll take a .223 or similar to the vitals at nearly twice the target size, when I get my chance, even if some meat is damaged.
If I WAS going solely for head shots, and it WAS legal, my gun of choice would be my CZ 453 Varmint in .17 HMR. In this state, during the 1-week fall turkey season, in SOME counties, you can use a rifle. In the spring, it's shotgun or bow only.